What is claimed is:1. An information processing apparatus comprising:a processor; wherein:the processor is configured to:calculate an order number of objects of a user if a number of the objects of the user is smaller than a predetermined number limit; andchange the order number of the objects so that, of a resource used for production of the objects, a portion which cannot be used for the production is not larger than a predetermined standard.2. The information processing apparatus according to claim 1, wherein:each of the objects is a piece of printed matter;the portion which cannot be used for the production is, of a predetermined unit paper sheet, a portion where no printing image is formed; andthe processor is configured to change the order number of the objects when the portion where no printing image is formed increases or decreases due to a change in number of the pieces of printed matter.3. The information processing apparatus according to claim 2, wherein:the processor is configured to increase or reduce the order number of the objects so as to prevent generation of the portion where no printing image is formed.4. The information processing apparatus according to claim 1, wherein:the processor is configured to increase or reduce the order number of the objects so as to make the order number of the objects equal to a number closest to the order number, of numbers which are integer multiples of a predetermined number.5. The information processing apparatus according to claim 4, wherein:the processor is configured to increase or reduce the order number of the objects so as to make the order number of the objects equal to a number closest to the order number, of numbers which are integer multiples of predetermined different numbers.6. The information processing apparatus according to claim 4, wherein:each of the objects is a piece of printed matter; andthe predetermined number is a number of faces in each of which the piece of printed matter can be printed on a predetermined unit paper sheet.7. The information processing apparatus according to claim 1, wherein:the processor is configured to increase or reduce the order number of the objects of each of a plurality of users so as to make a sum of the order numbers of the users equal to a number closest to the sum, of numbers which are integer multiples of a predetermined number.8. The information processing apparatus according to claim 7, wherein:the processor is configured to increase or reduce the order number of the objects of each of the users so as to make the sum equal to a number closest to the sum, of numbers which are integer multiples of predetermined different numbers.9. The information processing apparatus according to claim 1, wherein:each of the objects is a business card; andthe processor is configured to:estimate a remaining number of the business cards of the user from a number of business cards of other persons obtained by business card exchange with the other persons and registered into the information processing apparatus by the user; anddetermine the order number of the user based on the estimated remaining number of the business cards of the user.10. The information processing apparatus according to claim 2, wherein:each of the objects is a business card; andthe processor is configured to:estimate a remaining number of the business cards of the user from a number of business cards of other persons obtained by business card exchange with the other persons and registered into the information processing apparatus by the user; anddetermine the order number of the user based on the estimated remaining number of the business cards of the user.11. The information processing apparatus according to claim 3, wherein:each of the objects is a business card; andthe processor is configured to:estimate a remaining number of the business cards of the user from a number of business cards of other persons obtained by business card exchange with the other persons and registered into the information processing apparatus by the user; anddetermine the order number of the user based on the estimated remaining number of the business cards of the user.12. The information processing apparatus according to claim 4, wherein:each of the objects is a business card; andthe processor is configured to:estimate a remaining number of the business cards of the user from a number of business cards of other persons obtained by business card exchange with the other persons and registered into the information processing apparatus by the user; anddetermine the order number of the user based on the estimated remaining number of the business cards of the user.13. The information processing apparatus according to claim 5, wherein:each of the objects is a business card; andthe processor is configured to:estimate a remaining number of the business cards of the user from a number of business cards of other persons obtained by business card exchange with the other persons and registered into the information processing apparatus by the user; anddetermine the order number of the user based on the estimated remaining number of the business cards of the user.14. The information processing apparatus according to claim 9, wherein:the processor is configured to increase or reduce the determined order number of the user so as to make the determined order number of the user equal to a number closest to the determined order number of the user, of numbers which are integer multiples of a number with which the business cards can be produced from a printing paper sheet and which is the predetermined number, the printing paper sheet being the resource used for producing the business cards.15. The information processing apparatus according to claim 10, wherein:the processor is configured to increase or reduce the determined order number of the user so as to make the determined order number of the user equal to a number closest to the determined order number of the user, of numbers which are integer multiples of a number with which the business cards can be produced from a printing paper sheet and which is the predetermined number, the printing paper sheet being the resource used for producing the business cards.16. The information processing apparatus according to claim 11, wherein:the processor is configured to increase or reduce the determined order number of the user so as to make the determined order number of the user equal to a number closest to the determined order number of the user, of numbers which are integer multiples of a number with which the business cards can be produced from a printing paper sheet and which is the predetermined number, the printing paper sheet being the resource used for producing the business cards.17. The information processing apparatus according to claim 12, wherein:the processor is configured to increase or reduce the determined order number of the user so as to make the determined order number of the user equal to a number closest to the determined order number of the user, of numbers which are integer multiples of a number with which the business cards can be produced from a printing paper sheet and which is the predetermined number, the printing paper sheet being the resource used for producing the business cards.18. The information processing apparatus according to claim 13, wherein:the processor is configured to increase or reduce the determined order number of the user so as to make the determined order number of the user equal to a number closest to the determined order number of the user, of numbers which are integer multiples of a number with which the business cards can be produced from a printing paper sheet and which is the predetermined number, the printing paper sheet being the resource used for producing the business cards.19. A non-transitory computer readable medium storing an information processing program causing a computer to execute a process for information processing, the process comprising:calculating an order number of objects of a user if a number of the objects of the user is smaller than a predetermined number limit; andchanging the order number of the objects so that, of a resource used for production of the objects, a portion which cannot be used for the production is not larger than a predetermined standard.